NVIDIA has released a new beta of the ForceWare Graphics Drivers Release 100 (100.64) for Windows Vista (32 bit and 64 bit), which is one step forward in their new official plans for a functional Windows Vista driver.
According to the Release Notes there are still a lot of missing features, a lot of known issues and only a few small fixes, since the 97.46 WHQL driver.
If you experience any kind of problems please go to the newly established Vista Quality Assurance program by NVIDIA and report any problems with the NVIDIA drivers. Please submit any kind of NVIDIA related problems you have on Windows Vista so we can get working drivers for Windows Vista.